Lennox 78W99 Limit Switch 319847-401 (Energy Cut-Off) designed to interrupt

(Energy Cut-Off) designed to interrupt gas flow if water temperatures exceed 195°F

High Flow Capacity: The 1/2" NPT threading ensures consistent gas flow for medium-to-high BTU appliances

maintaining stable operation and protecting expensive downstream components like fan motors and compressors from premature wear

These flat sealing gaskets are engineered for a precise fit at 1-1/2" joints

eliminating the need for complex blowdown piping

Lennox 78W99 Limit Switch 319847-401 (Energy Cut-Off) designed to interruptThe Lennox 78W99 Limit Switch is a critical safety component engineered to regulate heat exchanger temperatures within Lennox G40, G41, G50, G51, and G61 gas furnaces. This L235 30F thermal limit control features a fixed temperature setting, designed to open the electrical circuit at 235F and automatically reset once temperatures drop by a 30F differential. Precision calibrated for high limit protection, this SPST (Single Pole Single Throw) switch